METHOD AND APPARATUS FOR DETERMINING A RESPIRATION SIGNAL
First Claim
1. A method for determining a respiration of a subject 005) comprising the steps of:
- generating, with a single multi-axial accelerometer positioned on a body of the subject, accelerometer signals indicative of the acceleration of the subject along different spatial axes,calculating a vector magnitude signal of the acceleration of the subject along the different spatial axes from the accelerometer signals,identifying from the vector magnitude signal a non-respiratory motion contribution to the acceleration along the different spatial axes which non-respiratory motion contribution is not caused by the respiration,determining a respiration signal indicative of the respiration of the subject by filtering the non-respiratory motion contribution from at least one of the accelerometer signals.
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Abstract
The invention relates to a method and apparatus for determining a respiration of a subject (305) in which, with a single multi-axial accelerometer (310) positioned on a body of the subject (305), accelerometer signals are generated (101) indicative of the acceleration of the subject (305) along different spatial axes, a vector magnitude signal of the acceleration of the subject (305) along the different spatial axes is calculated (102) from the accelerometer signals, a non-respiratory motion contribution to the acceleration along the different spatial axes is identified (103, 203) from the vector magnitude signal, which non-respiratory motion contribution is not caused by the respiration, and a respiration signal indicative of the respiration of the subject is determined (104, 204) by filtering the non-respiratory motion contribution from at least one of the accelerometer signals. In this way a method is provided which determines the respiration of a subject (305) with a single accelerometer (310) in an efficient and, for a patient, comfortable way.
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Citations
15 Claims
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1. A method for determining a respiration of a subject 005) comprising the steps of:
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generating, with a single multi-axial accelerometer positioned on a body of the subject, accelerometer signals indicative of the acceleration of the subject along different spatial axes, calculating a vector magnitude signal of the acceleration of the subject along the different spatial axes from the accelerometer signals, identifying from the vector magnitude signal a non-respiratory motion contribution to the acceleration along the different spatial axes which non-respiratory motion contribution is not caused by the respiration, determining a respiration signal indicative of the respiration of the subject by filtering the non-respiratory motion contribution from at least one of the accelerometer signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A respiration determination apparatus for determining a respiration of a subject, wherein the respiration determination apparatus comprises:
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a single multi-axial accelerometer for being positioned on a body of the subject, wherein the multi-axial accelerometer is adapted to generate accelerometer signals indicative of the acceleration of the subject along different spatial axes, a signal processing unit adapted for calculating a vector magnitude signal of the acceleration of the subject along the different spatial axes from the accelerometer signals and for identifying a non-respiratory motion contribution to the acceleration along different spatial axes from the vector magnitude signal, a respiration signal determination unit for determining a respiration signal indicative of the respiration of the subject by filtering the non-respiratory motion contribution from at least one of the accelerometer signals.
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Specification